<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <!-- 行 -->
        <el-col>
          <!-- 列 -->
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' :'']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5"> 
               <el-tag  closable
              @close="removeRightById(scope.row,item1.id)">
              {{item1.authName}}</el-tag>
               <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
               <el-col :span="19"> 
                 <!-- 通过for循环 嵌套渲染二级权限 -->
                 <el-row :class="[ i2 === 0 ? '' :'bdtop' ,'vcenter']" 
                 v-for="(item2, i2) in item1.children"  
                 :key="item2.id">
                   <el-col :span="6"> 
                     <el-tag type="success"  closable
                     @close="removeRightById(scope.row,item2.id)"> {{item2.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                   </el-col>
                   <el-col :span="18"> 
                     <el-tag type="warning" v-for="(item3, i3) in 
                     item2.children" :key="item3.id"   closable
                     @close="removeRightById(scope.row,item3.id)"> {{item3.authName}}</el-tag>
                   </el-col>
                 </el-row>
                </el-col>
            </el-row>
            <pre>{{ scope.row }}</pre>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit" 
         >编辑</el-button
            >
            <el-button size="mini" type="danger" icon="el-icon-delete"
              >删除</el-button
            >
            <el-button size="mini" type="warning" icon="el-icon-s-tools"
              @click="showSetRightDialog(scope.row)" >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

<!-- 分配权限的对话框 -->
     <el-dialog title="分配权限" :visible.sync="setRightDialogVisible"
  width="50%" @close="setRightDialogClosed">
  <!-- 树形控件 -->
  <el-tree :data="rightslist" :props="treeProps" show-checkbox
  node-key="id" default-expand-all 
  :default-checked-keys="defkeys" ref="treeRef"></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary"  @click="allotRights">确 定</el-button>
  </span>
</el-dialog>

  </div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表数据
      rolesList: [],
      //控制权限对话框的显示与隐藏
      setRightDialogVisible:false,
      rightslist:[],
      //树形控件的属性绑定对象
      treeProps:{
        label:'authName',
        children:'children'
      },
      //默认选中的节点Id值数组
      defkeys:[],
      //当前即将分配权限的角色id
      roleId:'',
      //控制修改角色对话框的显示与隐藏
      editDialogVisible:false,
     
    };
  },
  created() {
    // 获取角色列表
    this.getRolesList();
  },
  methods: {
    //获取所有角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");

      if (res.meta.status !== 200) {
        return this.$message.error("获取角色列表失败！");
      }

      this.rolesList = res.data;
      console.log(this.rolesList);
    },
    //根据Id删除对应的权限
   async removeRightById (role,rightId){
      //弹框提示用户是否要删除
      const consfirmResult = await 
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示',
       {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        if(consfirmResult !== 'confirm') {
          return this.$message.info('取消了删除！')
        }
        // 确认了之后就弹出删除了的消息
        const { data:res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`
        )
        //判断删除后状态码是否为200
        if (res.meta.status !== 200) {
          return this.$message.error('删除权限失败!')
        }

        // this.getRolesList()
        role.children = res.data
        //把服务器返回最新的权限，直接赋值给当前角色的children属性 防止用户列表被调用时，页面再次被刷新
        //为当前角色信息(role)重新赋值权限，
        //解决删除后重新获取角色信息(role)会刷新页面问题
    },

    //展示分配权限的对话框
    async showSetRightDialog(role){
      this.roleId = role.id
      // 发起请求获取所有权限数据
     const {data:res} = await this.$http.get ('rights/tree')
     if(res.meta.status !==200) {
       return this.$message.error('获取权限数据失败！')
     }
     //把获取到的权限数据保存到data中
      this.rightslist = res.data
      // alert(this.rightslist)
    
    //递归获取三级节点的Id
    this.getLeafkeys(role,this.defkeys)

      this.setRightDialogVisible = true
    },
    //通过递归的形式，获取角色下所有三级权限的id，并保存到 defkeys 数组中
    getLeafkeys(node,arr) {
      //如果当前 node 节点不包括
      //children 属性，则是三级节点
      if(!node.children) {
        return arr.push(node.id)
      }
      //遍历每一个权限节点，如果当前节点是三级节点就保存到数组arr
      node.children.forEach(item =>
      this.getLeafkeys(item,arr))
    },
    //监听分配权限对话框的关闭事件
    setRightDialogClosed(){
      this.defkeys = []
    },
    //点击角色分配权限
   async allotRights() {
      const keys = [
         ...this.$refs.treeRef.getCheckedKeys(),
         ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

     const {data:res} = await this.$http.post(`roles/
     ${this.roleId}/rights`,
      {rids:idStr})

      if(res.meta.status !== 200){
        return this.$message.error('分配权限失败!')
      }

      this.$message.success('分配权限成功!')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  },
};
</script>

<style>
.el-tag {
  /* margin:7px 7px 7px 7px; */
  margin: 7px 7px 7px 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>